# US 2012/0075046 A1 · Permanent magnet and motor and generator using the same

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- Number: US 2012/0075046 A1
- Document ID: US20120075046A1
- Status: Published application
- Kind: A1
- Application number: 13/049,518
- Filed: 2011-03-16
- Published: 2012-03-29
- Earliest claimed: 2010-09-24
- Assignees: Kabushiki Kaisha Toshiba
- Inventors: Masaya Hagiwara; Shinya Sakurada; Yosuke Horiuchi; Keiko Okamoto; Tsuyoshi Kobayashi; Shiori Kaji
- Web page: https://patentgrep.com/patent/US20120075046A1

## CPC

- H02K 1/02: characterised by the magnetic material
- C22C 1/02: by melting {(C22C1/1036 takes precedence)}
- C22C 28/00: Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00
- C22C 33/04: by melting
- C22C 38/005: {containing rare earths, i.e. Sc, Y, Lanthanides}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/10: containing cobalt
- C22C 38/14: containing titanium or zirconium
- C22C 38/16: containing copper
- H01F 1/0596: {of rhombic or rhombohedral Th2Zn17 structure or hexagonal Th2Ni17 structure}
- C21D 8/1205: involving particular fabrication steps or treatments of ingots or slabs
- C22C 2202/02: Magnetic
- H02K 1/2766: {having a flux concentration effect}
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)

## Abstract

In one embodiment, a permanent magnet has a composition represented by (Sm1-xRx)(FepMqCurCo1·p·q·r)z, where R is at least one element selected from Nd and Pr, M is at least one element selected from Ti, Zr and Hf, and 0.22≦p≦0.45, 0.005≦q≦0.05, 0.01≦r≦0.1, 0.05≦x<0.5, and 7≦z≦9. The permanent magnet includes a Th2Zn17 crystal phase as a main phase, and a ratio of diffraction peak intensity I(113) from a (113) plane of the Th2Zn17 crystal phase in powder X-ray diffraction to diffraction peak intensity I(300) from a (300) plane in powder X-ray diffraction is in a range of 0.9≦I(113)/I(300)≦1.7.

## Claims

### Claim 1

A permanent magnet comprising a composition represented by a composition formula:
(Sm1-xRx)(FepMQCurCo1-p-q-r)z
where, R is at least one element selected from Nd and Pr,
M is at least one element selected from Ti, Zr, and Hf,
p is a number (atomic ratio) satisfying 0.22≦p≦0.45,
q is a number (atomic ratio) satisfying 0.005≦q≦0.05,
r is a number (atomic ratio) satisfying 0.01≦r≦0.1,
x is a number (atomic ratio) satisfying 0.05≦x<0.5,
z is a number (atomic ratio) satisfying 7≦z≦9,
wherein the permanent magnet comprises a Th2Zn17 crystal phase as a main phase,
wherein a ratio of I(113) to I(300) is in a range of 0.9≦I(113)/I(300)≦1.7, where the I(113) is a diffraction peak intensity from a (113) plane of the Th2Zn17 crystal phase in powder X-ray diffraction, and the I(300) is a diffraction peak intensity from a (300) plane of the permanent magnet in powder X-ray diffraction.

### Claim 2 (depends on 1)

The permanent magnet according to claim 1,
wherein 50 atomic % or more of the element M is Zr.

### Claim 3 (depends on 2)

The permanent magnet according to claim 2,
wherein coercive force of the permanent magnet is 300 kA/m or higher and residual magnetization of the permanent magnet is 1.15 T or higher.

### Claim 4 (depends on 1)

The permanent magnet according to claim 1,
wherein a part of the Sm is replaced with at least one element selected from Y, La, Ce, Er, Tb, and Dy.

### Claim 5 (depends on 1)

The permanent magnet according to claim 1,
wherein 20 atomic % or less of the Co is replaced with at least one element selected from Ni, V, Cr, Mn, Al, Ga, Nb, Ta, and W.

### Claim 6 (depends on 1)

A permanent magnet motor comprising the permanent magnet according to claim 1.

### Claim 7 (depends on 1)

A generator comprising the permanent magnet according to claim 1.